The center caps have a thin metal like cover, don't know if anyone has noticed but the center caps become warped over time..this is normally from regular removal i.e cleaning, taking the wheels off etc.

The pic shows (left with...right without)
The plastic doesn't warp like the metal thats why i took them off.
_________________________

Mountune 165 kit
Mountune Billet "Short-Shift" Arm
Mountune mats/boot
Mountune Leather gaiter and bezel
Mountune PAS cooler kit
Goodridge braided brake lines
Magnecor HT leads
denso plugs
Redstuff pads